top fuel fact from here at work
-One dragster's 500-inch Hemi makes more
horsepower then the first 8 rows at Daytona -Under full throttle, a dragster engine consumes 1 1/2 gallons of nitro per second, the same rate of fuel consumption as a fully loaded 747 but with 4 times the energy volume. -The supercharger takes more power to drive than a stock Hemi makes. -Even with nearly 3000 CFM of air being rammed in by the supercharger on overdrive, the fuel mixture is compressed into nearly-solid form before ignition. Cylinders run on the verge of hydraulic lock. -Dual magnetos apply 44 amps to each spark plug. This is the output of an arc welder in each cylinder. -At styceometric (exact) 1.7:1 air/fuel mixture (for nitro), the flame front of nitromethane measures 7050 degrees F. -Nitro methane burns yellow. The spectacular white flame seen above the stacks at night is raw burning hydrogen, dissociated from atmospheric water vapor by the searing exhaust gases. -Spark plug electrodes are totally consumed during a pass. After 1/2 way, the engine is dieseling from compression-plus the glow of exhaust valves at 1400 degrees F. The engine can only be shut down by cutting of its fuel flow. -If spark momentarily fails early in the run, unburned nitro builds up in those cylinders and then explodes with a force that can blow cylinder heads off the block in pieces or blow the block in half. -Dragsters twist the crank (torsionally) so far (20 degrees in the big end of the track) that sometimes cam lobes are ground offset from front to rear to re-phase the valve timing somewhere closer to synchronization with the pistons. -To exceed 300 mph in 4.5 seconds dragsters must accelerate at an average of over 4 G's. But in reaching 200 mph well before 1/2 track, launch acceleration is closer to 8 G's. -Drivers shut off before the finish line, or even dual parachutes will not stop the car. -If all the equipment is paid off, the crew worked for free, and for once NOTHING BLOWS UP, each run costs $1000.00 per second. -Dragsters reach over 300 miles per hour before you have read this sentence. |
You're right.
There's nothing like the sound of a nitro engine at full song. Ever see a top fuel rail at idle? Watch the exhaust stacks. You'll see liquid spitting out, it's unburned fuel. If spark momentarily fails early in the run, unburned nitro builds up in those cylinders and then explodes with a force that can blow cylinder heads off the block in pieces or blow the block in half. |
this is a cool bunch of facts. :)
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Very Interesting that is a dream of mine to run the quarter in a nitro dragster.
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More;
The octane rating of Nitro is -1000 Squared Ignition timing changes throughout the pass starting from NEGATIVE 8 to NEGATIVE 14 degrees. It takes close to 800hp to turn the blower. Motor accelerates from 2700rpm idle to 8200rpm in .1 sec The exhaust valves must open against 9000 PSI. Makes us realize how "low performance" our motors are. ;) |
How about the total number of revolutions a top fuel motor makes between tear downs is about 1600.
-Greg |
what??? 1600??? what r u talking about???
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Heard if from Dean Skuza, also you can figure it out as roughly:
20 seconds of idle to line up (500 rev), 3 seconds for burnout (400 rev), 5 seconds for run(667 rev), that would total up to 1567 revolutions. -Greg |
Very Cool reading.
Jan |
Love it, thanks for sharing!
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